GE IS230TNSVH3A

Description

IS230TNSVH3A

TSVCH1A/PSVOH1B(3X) MODULE

PLC memory includes user and system. User memory is mainly used to store user programs, and some of them are also used by the system individually. The system memory is configured with the CPU. The CPU should not only have the ability to access these memories, but also provide corresponding storage media.

The size of user memory is related to the amount of user programs that can be stored. With large memory and large amount of programs that can be stored, more complex control can be carried out. From the perspective of development trend, the memory capacity is always increasing. The memory capacity of large PLC can reach tens of k, even more than 100 k. The system memory for users is mainly reflected in how many internal devices PLC can provide. Different internal devices occupy different areas of the system memory. There are no such devices physically, just RAM. However, these devices are actually provided to users when they are used by running programs.

The more types and quantities of memory devices, the more convenient it is for PLC to carry out various logic quantities and analog control. It is also an important indicator of PLC performance.

PLC internal devices include:

I/O relay, or mapping area. It is directly related to the number of I/O points that PLC can control and the number of analog channels.

The number of internal relays, some of which are called flag digits, represents the number of internal relays of PLC. It is associated with the I/O relay area and sometimes with the latter for processing. There are many internal relays, which is convenient for PLC to establish complex time sequence relationship to achieve various control requirements. Generally speaking, there are more internal relays than I/O relays.

Some internal relays can also be maintained after power loss, that is, their status (ON or OFF) and PLC can still be maintained by internal battery after power loss. The state before power loss can be continued after power on again. Holding relay can enhance PLC control ability, especially for recording faults and recovering operation after troubleshooting.

Timer, timing control is available. The timing value can be set arbitrarily. The number of timers, the setting range and the resolution of the setting value all represent the performance of the timing device.

Counter, which can count and send corresponding signals when reaching a set count value. What kind of counting can be performed, how large the counting range is, how to set it, and how many counters are representative indicators of PLC counter performance.

The data storage area is used to store working data. Most of them are used in words, two words or more words, which is necessary for PLC to control analog quantity or record data. The size of this storage area represents the performance of the PLC. The trend is also growing. The same is true for minicomputers. For example, the CQM1 of OMRON in Japan has 6k characters in its DM area. In the past, the DM area of the C60P, which is also a minicomputer, was only 64 words. The DM of mainframe can reach 10K or even tens of K.